"Wuxianlou" claims to be "all methods have no face", and the entrance ceremony is to tear off one's own "face" - a human skin mask.
After the protagonist completed the ritual, he saw a completely unfamiliar face in the mirror. That face was smiling at him, but he was clearly not smiling.
What's even weirder is: the little finger on the left hand of the person in the mirror is missing, exactly like him.
Who copied whom?
That night, there was a snowstorm in Yili River. He escaped from the sect and headed north, trying to find his "original face", but he only saw more of "himself" under the ice.
Concept: In an era where "identities can be copied and memories can be bought and sold," the real horror is not losing one's face, but losing one's name that is remembered by others.